Hand pump

Abstract

A double acting pump includes an elongated thin walled hollow barrel, having an inlet end and a head end, and an elongated hollow plunger slidably received in said barrel and forming with its inner surface an annular space. A two piece detachable fitting includes one part on the head end of the barrel, and a mating part with a seal between one end of the barrel and the outer surface of the plunger. A valve assembly and seal is mounted on the inlet end of the plunger, with that seal engaging the interior of said plunger. A nozzle is mounted on the discharge end of the plunger. A two piece inlet fitting includes one part on the inlet end of the barrel, a mating detachable part having an inlet valve seat, and a check valve captured between the parts of the inlet fitting and cooperating with the seat to allow flow into the barrel. A filter piece is supported in the detachable part of the inlet fitting and also functions to capture the check valve between the seat and the filter piece.

What is claimed is: 
     
       1. In a double acting pump including an elongated thin walled hollow barrel having an inlet end and a head end, said ends of said barrel having outwardly turned edges,   an elongated hollow plunger having a discharge end and an inlet end slidably received in said barrel and defining with the inner surface thereof an annular space,   a two piece detachable fitting including one part on the head end of said barrel and a mating part including a seal between said one end of said barrel and the outer surface of said plunger, said parts of said fitting being engaged around the outwardly turned edge of said head end,   a valve assembly and seal mounted on the inlet end of said plunger, said seal engaging the interior of said plunger,   a nozzle on said discharge end of said plunger,   a two piece inlet fitting including one part on the inlet end of said barrel and a mating detachable part having an inlet valve seat, said parts of said inlet fitting being engaged around the outwardly turned edge of said inlet end,   and a check valve captured between said parts of said inlet fitting and cooperating with said seat to allow flow into said barrel.   
     
     
       2. A pump as defined in claim 1 wherein a filter piece is supported in said detachable part of said inlet fitting and also functions to capture said check valve between said seat and said filter piece. 
     
     
       3. A pump as defined in claim 1 wherein said two piece fittings are provided with cooperating bayonet lug and slot configurations enabling said fittings to be parted without tools and to be joined in sealed relation. 
     
     
       4. A pump as defined in claim 1 wherein said two piece fittings are provided with cooperating coarse threaded parts capable of engagement and disengagement without tools, and retainers arranged to hold said parts in fully engaged relation.